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At installation time when GF4 is included and Java6 is selected by the user (which will be a valid combination for 7.3.1) the installer should warn the user that she will need to set Java 7 for GF4 runtime in the server's properties in the IDE before starting GF4 for the first time. See also related issue 227350.
Fixed in branch - http://hg.netbeans.org/core-main/rev/9be8345f7ae6
http://hg.netbeans.org/core-main/rev/6afda1efc7bf
backported to release73 - http://hg.netbeans.org/releases/rev/0d7c9d19c43b